Document Type Definition - definizione. Che cos'è Document Type Definition
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Cosa (chi) è Document Type Definition - definizione

SET OF MARKUP DECLARATIONS THAT DEFINE A DOCUMENT TYPE FOR AN SGML-FAMILY MARKUP LANGUAGE
Document-type Definition; .dtd; Document Type Definition; XML DTD

Document Type Definition         
<text, standard> (DTD) The definition of a document type in SGML or XML, consisting of a set of mark-up tags and their interpretation. Docbook DTD home (http://oasis-open.org/docbook/). XML DTD Tutorial (http://xml101.com/dtd). (2001-04-30)
Document type definition         
A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (GML, SGML, XML, HTML).
Document type declaration         
INSTRUCTION THAT ASSOCIATES A PARTICULAR SGML OR XML DOCUMENT WITH A DOCUMENT TYPE DEFINITION (DTD)
DocType; DOCTYPE; Doctype; Doc type; Doctype switching; Doctype declaration; Document Type Declaration; !DOCTYPE; HTML DOCTYPE
A document type declaration, or DOCTYPE, is an instruction that associates a particular XML or SGML document (for example, a webpage) with a document type definition (DTD) (for example, the formal definition of a particular version of HTML 2.0 - 4.

Wikipedia

Document type definition

A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (GML, SGML, XML, HTML).

A DTD defines the valid building blocks of an XML document. It defines the document structure with a list of validated elements and attributes. A DTD can be declared inline inside an XML document, or as an external reference.

XML uses a subset of SGML DTD.

As of 2009, newer XML namespace-aware schema languages (such as W3C XML Schema and ISO RELAX NG) have largely superseded DTDs. A namespace-aware version of DTDs is being developed as Part 9 of ISO DSDL. DTDs persist in applications that need special publishing characters, such as the XML and HTML Character Entity References, which derive from larger sets defined as part of the ISO SGML standard effort.